SOUTH SAN FRANCISCO, Calif., Oct. 31, 2013 (GLOBE NEWSWIRE) -- Portola Pharmaceuticals, Inc. (Nasdaq:PTLA) today announced that it will host a webcast and conference call to discuss the Company's financial results for the quarter ended September 30, 2013 and to provide a general business overview on Tuesday, November 5, 2013 at 4:30 p.m. Eastern Time (1:30 p.m. Pacific Time).